Erschienen in:
06.08.2019
Evaluation of radiation doses at diagnostic X-ray control panels and outside patient entrance doors in Aizawl district, India
verfasst von:
Jonathan Lalrinmawia, Kham Suan Pau, Ramesh Chandra Tiwari
Erschienen in:
Radiological Physics and Technology
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Ausgabe 3/2019
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Abstract
The purpose of this research was to measure the radiation level and estimate the dosage at the control panel (CP) and outside the patient entrance door (PED) of diagnostic X-ray installations. This is important for ensuring the safety of workers and the public, particularly in the study area, where there is no proper radiation monitoring service. A water phantom, 10-L fresh water in a plastic container, was used as the source of scattered radiation. Using an ion-chamber survey meter, the stray radiation rate was measured at the CP and outside the PED for both chest and couch missions. The CPs were fully covered by a protective barrier, providing a negligible exposure rate (i.e., 0.07–4.2 mR/h for chest and 0.21–3.8 mR/h for couch). By contrast, installations that did not properly cover the CP showed relatively high exposures (from 18 to 205 mR/h for chest and 2.4–270 mR/h for couch). The radiation rates outside the PED in installations having lead-lined doors were negligibly low; whereas, in installations having no lead-lining, exposure rates reached as high as 95 and 110 mR/h for chest and couch missions, respectively. The occupational doses were well below the Atomic Energy Regulatory Board dose limit (i.e., 40 mR/week). However, excessive doses were observed in public spaces outside the PED, compared with the dose limit for the public (i.e., 2 mR/week).